Magnetic-Field Induced Gap in One-Dimensional Antiferromagnet KCuGaF$_6$

Details Magnetic-Field Induced Gap in One-Dimensional Antiferromagnet KCuGaF$_6$ Magnetic-Field Induced Gap in One-Dimensional Antiferromagnet KCuGaF$_6$

2006-07-19

arxiv.org/abs/cond-mat/0607469v1

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to Proceedings of Research in High Magnetic Field

Scientific paper

10.1088/1742-6596/51/1/041

Magnetic susceptibility and specific heat measurements in magnetic fields were performed on an $S=1/2$ one-dimensional antiferromagnet KCuGaF$_6$. Exchange interaction was evaluated as $J/k_{\rm B}\simeq 100$ K. However, no magnetic ordering was observed down to 0.46 K. It was found that an applied magnetic field induces a staggered magnetic susceptibility obeying the Curie law and an excitation gap, both of which should be attributed to the antisymmetric interaction of the Dzyaloshinsky-Moriya type and/or the staggered $g$-tensor. With increasing magnetic field $H$, the gap increases almost in proportion to $H^{2/3}$.

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